Buy Z 100 - Bonus (Buy Z 100 in one transaction and we give you 50 more Zillcoins.)
Buy Z 1,000 - Super Bonus (Buy Z 1,000 in one transaction and we give you 1,000 more Zillcoins.)
Buy Z 10,000 - Mega Bonus (Buy a block of 10,000 Zillcoins in one transaction and we give you 20,000 Zillcoins.)